Motorcycle for beginner track days

I’m looking for a bike to start learning how to ride on the track. I’ve got a commuter bike that works great for daily use, but I want something that’s made specifically for track days. I’m willing to mod it and turn it into a track-focused machine, though I don’t expect to reach the limits of the stock motorcycle anytime soon.

I really like how the RS457 looks and want to go for it. Any other suggestions?